Prime and composite

Front

What is a prime number?

Back

A prime number is a number greater than 1 that has exactly two factors: 1 and itself.

Front

What is a composite number?

Back

A composite number is a number greater than 1 that has more than two factors.

Front

Is 1 a prime number or a composite number?

Back

Neither, because it has only one factor.

Front

List the factors of 12.

Back

1, 2, 3, 4, 6, 12

Front

What is the smallest prime number?

Back

2, which is also the only even prime number.

Front

What is the largest prime number less than 20?

Back

19

Front

What is a factor?

Back

A factor is a number that divides another number without leaving a remainder.

Front

What is the relationship between even numbers and the number 2?

Back

All even numbers have 2 as a factor.

Front

List the first five prime numbers.

Back

2, 3, 5, 7, 11

Front

What is the prime factorization of 18?

Back

2 x 3 x 3 or 2 x 3².